Sheave lock



oct. 7, 1924. 1,511,039

H. C. DINDINGER sHEAvE'LoCK Filed D ec. l1 1932 Patented Oct. 7, i924.

isms

HARRY C. DlNDNGE/f, Gil? MG'LlTE, ILLINOIS.

sirnavn 'Loon Application filed December l1, 1922. Serial No. 606,074

.T all whom t may concern.'` c

Be 'it known that I, Hanni' C. DINDINGER, a citizen of the UnitedStates, residing at Moline, in the county of Roel; island and State ofillinois, have invented a certain new and useful mproveniient in aSheave Loch, of which the following is a full, clear, and exactdescription, reference being had to the accompanying` drawings.

This invention is concerned with means for locking av rope or cable to asheave and has for one of its objects the provision of a simple andefficient locking mechanism which may be satisfactorily operated onropes or cables of various sizes.

i-in additional object includes the construction of a locking mechanismwhich may be readily actuated by swinging the free end of a cablerelatively to the sheave, and without slacking the free end during. theswinging operation.

A stil-l further object is the provision of a locking device which maybe so mounted uponf-the frame' which supports the sheave so that thecable may be pass-ed over the sheave without necessitating a threadingof the 'free end of the cable-between the sheave and fram-e.

In carrying out my invention, I employ a brak-e shoe or locking dog,which is mounted to swing over a pulley sheave and` against the rope orcable which travels over the sheave, and mount the mechanism foractuating the shoe upon a frame in which the pulley is carried.l Thedirectionl in which the shoe is movable for locking. purposes is thesame as the direction of pull on the cable, whereby the shoe tends toremain in loclredlposition. To facilitate the operartion of the shoe Iso arrange the actuating mechanism that the free end of the cable orrope may be used as a lever to control vthe position of the shoe.`

The means for carryingv out the above objects will be more fully setforth in the following description, whichv pertains to the accompanyingdrawings, and the lessential characteristics will be summarized in theclaims.V v

In the drawings, Fig. 1 isa side elevation of a sheave havingy a lockassociated therewithembodying my invention.; Fig. 2 is a similar -viewshowing the lock in open position; Fig. 3 is asection taken through thelock on the line 3-3 in Fig. l; while Fig.

particularly a is a longitudinal section taken on the correspondinglynumbered line in Fig. 3.

In the various figures, I have shown a sheave which is rotatably mountedupon a. shaft l1, which in turn is journaled ina frame. This frame isshown as a U-shaped member having sides land 14, which straddle thesheave and provide a suitable support for the looking mechanism as willbe hereinafter described. @ne side of the frame, as at 14C, may beextended beyond the locking mechanismand be provided with an enlargementl15. In the enlargement l have shown an' opening 16 together with aretaining pin 17 for holding the sheav'e in a convenient support 18, asindicated in Fig. 1.

The frame supporting the sheave also carries the loch. This lockcomprises a shoe 19 which is pivotally mounted, as at 20, l'to a lockinglever 21. This shoe is arranged Vto be moved relatively tol the sheaveand to be turned during such movement in such manner that the clampingface 22 remains parallel to vthe periphery of the sheave. To effect thismovement, l have shown the shoe as having an extension 23j, which ispro5- vided with a slot 24:. This slot co-operates with the shaft 11 tomaintain the clamping face of the'shoe parallel to the sheave wheneverthe looking lever 21 is moved relatively to the sheave. Thetwopositionsof the shoe showing the movement of the slot 24 is shown in F ig. 4 at24 and 24a.

The locking lever which supports the shoe is shown as an irregularlyshaped member which is formed at one end, as at 25, to receive the pin2O and at the other end, as at 26, to receive a shaft 27 which iscarried by the sheave frame. l have shown this lever rigidly attachedyto the shaft 27 by means of a pin 28, and I have also shown a spring 29which surrounds the lower part of 1lhe locking lever and is attached atone end to the lever and at the other end to the frame so as normally tourge the locking lever into clamping position. This position is Ashowninv full lines in Fig. il. A

To permit movement of the locking lever with relation toithe sheave, lprovide an arcuate slot 30 through which the shaft'll extend. Tn thisway', arcuate movement of the llocking lever is limitedl and iscontrolled for receiving various sizes of ropes which pass over thesheave.

W ith the mechanism heretofore described., a cable B which passes overthe sheave is normally locked by the spring 29. Accordingly, to releasethe cable it is only necessary to move the looking lever 2l against theforce of the spring to the position indicated by the broken lines inFig. 4. To accomplish this movement without necessitating considerableinconvenience and power, T provide a mechanism which may be actuated bya single swinging movement of the free end C of the cable.

The. means for actuating the locking lever 2l is shown as a rock lever35 which is pivotally mounted on the shaft ll outside the sheave fiameand is bifurcated, as at 36,

to receive` the crank arm 37 which may form an extension of the shaft2T. The outer endl of this rock lever carries a pin 38 which moves in anarcuate slot 39 in a tripping lever 40. This tripping lever is shown aspivoted at 4l to the side 14 of the frame. The free end of the trippinglever extends beyond the sheave and may be provic ed with a pair ofoppositely disposed cable guides 42 and 43 which extend inwardly towardthe sheave. Assuming that the cable B is placed around the sheave, andthat the free end C is inserted between the guides on the trippinglever, and further that the shoe is in locked position as shown in Fig.l, then to release the cable it is only necessary to swing the trippinglever in the direction indicated by the arrow Dv in Fig. l. This isaccomplished by swinging the free end of the rope which passes throughthe guides. liVhen the tripping lever is swung as indicated, their thepin 38 is raised by the slot 39 whereupon the forked end of the roc-lrlever is swung from the position indicated in Fig'. l., to the positionindicated in Fig. 2. Thus the crankI arm 37, locking lever 25, and shoei9 are simultaneously moved downwardly' and are maintained in suchposition, until the cable is swung baclrwaidly to the position indicatedin llig. l. Since the load is in the direction indicated by the arrow lin the various figures, then as soon as the free end of the cable isswung baclrwardly to its original position, the shoe is brought intocontact with the cable in a direction correspo'iding to that of theload. Thus the brake shoe is moved to locking position whenever the areaof contact between the table and sheave is decreased and is releasedwhenever the area of Contact is increased.

rin advantage of a sheave loclr'constructed according to my inventionisthat the cable may be placed over the sheave without threading thefree end thereof through the frame. This follows by reason of the factthat the side 13 of the frame terminates short of the periphery of thesheave, and also for the reason that the locking shoe, together 'thefree end of the member and connecte with the associated mechanism, iscarried by the opposite side of the frame. vThis .is particularly usefulwhenever it is desired to use the lock for holding comparatively longcables.

l claim l. lin combination, a sheave, supporting frame therefor, alocking shoe mounted on the frame and moi/able relatively thereto, andmeans for maintaining the clamping face of the shoe concentric to theperiphery of the sheave during such movement.

9,. fin combination, a sheave, a brake shoe movable toward and away fromthc sheave, means for maintaining the clamping face of the brake shoeduring such movement concentric to the perilgihery of the sheave, a.tiexible load supporting member passing over the sheave, and mechanismengaging d with the shoe whereby variations in the area of Contactbetween the member and sheave effect relative movement between the shoeand said sheave.

3. In combination, a sheave, a supporting frame therefor, said framehaving one side open, and a locking shoe movable relatively to thesheave and frame, and means for mounting the shoe on the frame to permita flexible hoisting member to be passed over the sheave adjacent theopen side of the frame without threading the free end of the memberthrough the sheave.

4. Tn combination, a sheave, a frame therefor, a lever pivotally mountedon the frame, a brake shoe associated with said lever, andmeansassociated with the lever for retaining the clamping face of theshoe concentric with the periphery of the sheave whenever the lever ismoved relatively to the frame.

5. Tn combination, a sheave, a supporting` member therefor, a leverpivoted to said member remote from the axis of said sheave, a shoecarried by said lever, a second lever cooperating with the firstmentioned lever for controlling the operation of said shoe, and meansfor normally urging the first lever so as to bring the shoe into lockingposition.

6. Tn combination, an open sided frame, a sheave journaled therein, alever pivotally mounted within the frame beyond the periphery of thesheave, a brake shoe carried by the lever at the side of the sheaveopposite the pivotal connection of said lever, and means for urging theshoe into locking position.

7. In combination, a sheave, a supporting frame therefor, a brake shoemounted within the frame, and mechanism including a pair of cooperatinglevers for swinging the brake shoe relatively to the sheave.

8. In combination, a sheave, a supporting frame therefor, a leverpivotally mounted llt) CJD

to swing within the frame, a brake shoe carried by the lever, andmechanism including members having pin and slot connections foractuating the first mentioned lever to operate said shoe.

9. In combination, a frame, a sheave journaled in said frame, a brakeshoe, a rock lever pivoted to the frame so as to swing about the axis ofthe sheave, means whereby the free end of the cable passing over thesheave may actuate one of said levers, and mechanism controlled by theother end of said lever for moving said shoe relatively to the sheave.

10. In combination, a frame, a sheave journaled therein, a fieXib-leload engaging member passing over the sheave, a lever having one endthereof pivotally mounted on the frame, a brake shoe carried by theother end of the lever and adapted to clamp said member to the sheave, arock lever pivoted to said frame and operatively connected with the shoecarrying lever, and a tripping llever operatively connected with therock lever, whereby movement of said rock lever in one direction effectsa corresponding movement of the shoe relatively to the sheave.

l1. In combination, an open sided frame, a shaft extending therethrough,a sheave journaled onthe shaft within the frame, 'a lever pivotallymounted on the frame and having an arcuate slot co-operating with saidshaft for limiting the movement of the lever relatively t0 the frame, abrake shoe caried by the lever, said shoe having an extension projectingbeyond the shaft and intermediate the lever and sheave, said extensionhaving a slot co-operating with said shaft whereby movement of the leverrelatively to the frame maintains the clamping face of said shoeconcentric to the periphery of the sheave. Y

l2. In combination, an open sided frame, a shaft extending therethrough,a sheave journaled on the shaft within the frame, a lever pivotallymounted on the frame and having an arcuate slot co-operating with saidshaft for limiting the movement of the lever relatively to the frame, abrake shoe carried by the lever, said shoe-having an extensionprojecting beyond the shaft and intermediate the lever, said extensionhaving a slot co-operating with said shaft whereby movement of the leverrelatively to the frame maintains the clamping face of said shoeconcentric to the periphery of the sheave, a rock lever pivoted on saidshaft outside the frame, said rock lever being operatively connected atone end withfthe shoe carrying lever, and means whereby the free end ofa load engaging member passing over the end of the sheave may actuatethe rock lever to control the operation of said shoe. p

13. In combination, an open sided frame, a shaft extending therethrough,a sheave journaled on the shaft within the frame, a load engaging memberpassing over the sheave, a lever pivotally mounted on the frame andhaving an arcuate slot co-operating with said shaft for limitingmovement of the lever relatively to the frame, a brake shoe carried bythe lever, said shoe having an extension projecting beyond the shaft andintermediate the lever and sheave, said extension having a slotco-operating with said shaft whereby movement of the lever relatively tothe frame maintains the clamping face of said shoe concentric to theperiphery of the sheave, a rock lever pivoted on said shaft outside theframe, said rock lever being operatively connected at one end with theshoe carrying lever, a tripping lever having one end pivoted to theframe and having the free end formed to receive the free end of the loadenga-ging` member,

and means connecting the rock lever and tripping lever whereby movementof the free end of the tripping lever controls the operation of saidshoe.

In testimony whereof, I hereunto aflix my signature.

HARRY C. DINDINGER.

